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IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record

作者： J.M. Holtzman L.M.A. Jalloul Wireless Information Network Laboratory (WINLAB) Department of Electrical and Computer Engineering Rutgers State University of New Jersey Piscataway NJ USA

The authors present an analysis of the mitigation of the Rayleigh fading effect for wideband direct sequence pseudonoise signaling. The reduction of the Rayleigh fading effect is an advantage of code division multiple access (CDMA) over narrowband transmission systems and it eases the burden of CDMA power control. A general expression for the standard deviation of the received wideband signal power is derived. It is shown how the standard deviation decreases as the bandwidth spreading increases. The authors also analyzes the time correlation needed for other analyses (e.g., CDMA power control).< >

关键词： Rayleigh channels Wideband Multiaccess communication Power control Frequency diversity Narrowband Delay Land mobile radio Bandwidth Fading

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Autoassociative neural memory capacity and dynamics

Autoassociative neural memory capacity and dynamics

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International Joint Conference on Neural networks (IJCNN)

作者： M.H. Hassoun A.M. Youssef Computation and Neural Network Laboratory Department of Electrical and Computer Engineering Wayne State University Detroit MI USA

Storage capacity and retrieval dynamics of autoassociative neural memories (ANMs) are investigated. An associative memory capacity measure based on the memory's performance versus the number of stored memory vectors (where performance is defined in terms of the memory's error-correcting ability and its fundamental memories' attraction volumes) is introduced. The proposed capacity/performance measure has been tested for several ANMs having the same dynamic Hopfield-memory-like architecture, each using a different recording technique. Correlation, generalized inverse (orthogonal), and Ho-Kashyap memory recordings have been investigated. Monte Carlo analysis has been performed on ANMs recorded with randomly generated patterns in order to determine and compare performance characteristics and retrieval dynamics

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Packet reservation multiple access over slow and fast fading channels

Packet reservation multiple access over slow and fast fading...

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IEEE Conference on Vehicular Technology (VTC)

作者： L.M.A. Jalloul S. Nanda D.J. Goodman Wireless Information Network Laboratory (WINLAB) Department of Electrical and Computer Engineering Rutgers State University of New Jersey Piscataway NJ USA

Packet reservation multiple access (PRMA) allows a group of spatially dispersed terminals to transmit packet voice and data over a common channel. A means to model and evaluate the effects of packet transmission errors on PRMA is developed. PRMA is considered in the context of a cellular system, and the effects of fading on the performance of PRMA are studied. PRMA performance is assessed in terms of system capacity, outage, and cellular efficiency when the transmission channel is subject to slow and fast fading. It is shown that for fast-fading channels simple forward-error correction is sufficient for acceptable system performance. In slow-fading channels, however, other techniques such as selection diversity are required.< >

关键词： Fading Base stations Delay Speech Error probability System performance Land mobile radio Additive white noise Error analysis AWGN

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The high‐performance parallel interface (HIPPI) and ultra‐speed networks

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AIP Conference Proceedings 1990年第1期209卷

作者： Don E. Tolmie Los Alamos National Laboratory C‐5 Computer Network Engineering MS‐B255 Los Alamos New Mexico 87545

We have had excellent success, and user productivity increases, with a research project which provided computer‐generated video‐type output of physics calculations. Now we are investigating ways to provide this visualization capability to many users in a networked environment. We see the need for networking with channel speeds in the 800‐Mbit/s between machines. A basic building block to achieve this capability is the High‐Performance Parallel Interface (HIPPI) being worked on in American National Standards Institute (ANSI) Task Group X3T9.3. The HIPPI provides a point‐to‐point channel with speeds of 800 and 1600 Mbit/s (100 and 200 MByte/s). Industry interest is very high, and vendors are starting to produce hardware. Los Alamos is also working with some vendors on computer networks built around the HIPPI, crossbar switches, and intelligent network interfaces. A project is also underway to develop a fiber‐optic transport media to support the higher layer protocols of HIPPI, the Intelligent Peripheral Interface (IPI) and the Small computer Systems Interface (SCSI).

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THE COMMAND SUPPORT AT-SEA EXPERIMENT

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NAVAL ENGINEERS JOURNAL 1990年第3期102卷 25-36页

作者： BUSCHER, DJ SUNDAY, DM David J. Buscher:is an electrical engineer on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his BS degree in electrical engineering from Villanova University in 1967 an MSEE degree from the University of Maryland in 1972 and an MS degree in technical management from The Johns Hopkins University in 1985. He was the lead engineer on the Command Support At-Sea Experiment Project. He started his career in 1967 with the U.S. Army Harry Diamond Laboratory working on computer and communications projects. During this time he worked in Vietnam with the United States Army Vietnam Science Advisor Office. Since joining JHU/APL in 1978 he has worked on a variety of projects associated with computer graphics hospital patient information systems computer networks autonomous underwater vehicles and satellite communications. He is currently assistant group supervisor of the Computer Systems Group. Daniel M. Sunday:is a mathematician on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his Ph.D. in mathematics from the University of Minnesota in 1971 and did postdoctoral research on neural networks at the University of California at Berkeley. Since joining JHU/APL in 1980 Dr. Sunday has worked as a designer and developer of software systems with emphasis on medical imaging interactive graphics natural language interfaces and software standards. He was the network designer for the Headquarters Integrated Office System (HIOS) Network for the Army at the Pentagon. He is currently the lead software engineer on the Command Support At-Sea Experiment Project.

The Command Support At-Sea Experiment (CS@SE) provides experimental advanced graphics display systems consisting of large screen color displays and operator console color displays in the combat information center (CIC) of an Aegis cruiser and in the tactical flag command center (TFCC) of an aircraft carrier. CS@SE systems are designed to prototype potential command support capabilities in an at-sea environment to validate and refine requirements for planned production system upgrades. These systems use sophisticated color graphics techniques to provide real-time tactical displays that improve the availability of information to an operator by reducing clutter through the use of color, area fill, transparen overlays and intensity coding of track symbols. Interfaces wen developed with the Aegis Display System (ADS), Shipboarc Gridlock System with Auto-correlation (SGS/AC), Flag Dats Display System (FDDS) and Tomahawk Engagement Planning and Exercise Evaluation System (TEPEE) that provided the data for the presentation of a tactical display. Display elements included both real-time and over-the-horizon (OTH) surface track data, velocity leaders, tags, uncertainty ellipses, and history trails. The display also included filled land masses, country boundaries, commercial airways, cities, graphics overlays (i.e., operational areas), weapon system missile performance contours, and engagement plans. This paper describes the experiment, its installation and integration into the shipboard environments of an Aegis cruiser (USS Leyte Gulf ) and an aircraft carrier (USS America , its usage by the ships companies and embarked staffs, and the experiment result! and findings. Key conclusions of the experiment are: 1 Advanced graphics color displays can significantly enhance the ability of the warfighter to assimilate a complex tactical display. 2 Both ships reported a requirement for a correlated OTH and real-time track display with the ability to clearly differentiate the two types

关键词： computer Graphics

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MULTIPLE CROSSBAR network INTEGRATED SUPERCOMPUTING FRAMEWORK 89

MULTIPLE CROSSBAR NETWORK INTEGRATED SUPERCOMPUTING FRAMEWOR...

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CONF ON SUPERCOMPUTING ( SUPERCOMPUTING 89 )

作者： HOEBELHEINRICH, R THOMSEN, R Computer Network Engineering Computing and Communications Division Los Alamos National Laboratory Los Alamos New Mexico

ISBN: (纸本)0897913418

At Los Alamos National laboratory, site of one of the world's most powerful scientific supercomputing facilities, a prototype network for an environment that links supercomputers and workstations is being developed. Driven by a need to provide graphics data at movie rates across a network from a supercomputer to a scientific workstation, the network is called the Multiple Crossbar network (MCN). It is intended to be a coarsely-grained, loosely-coupled, general-purpose multicomputer framework that will vastly increase the speed at which supercomputers communicate with each other in large networks. The components of the network are described, as well as work done in collaboration with vendors who are interested in providing commercial products.

关键词： computer systems, Digital

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The high-speed channel (HSC) standard

The high-speed channel (HSC) standard

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IEEE Compcon

作者： D.E. Tolmie C-5 Computer Network Engineering MS-B255 Los Alamos National Laboratory Los Alamos NM USA

The high-speed channel (HSC) is a simple high-performance, point-to-point channel for transmitting digital data at peak data rates of 800 or 1600 Mb/s. The transmission distance between data-processing equipment using copper cabling can be up to 25 m. A distance-independent protocol allows the average data rate to approach the peak data rate. This is a benefit for future, fiber-optic version of the HSC. The HSC and its uses are described, followed by a description of the efforts to develop an ANSI standard for the HSC.< >

关键词： Protocols Laboratories Copper ANSI standards Open systems Error correction computer networks Data engineering Optical fiber cables Optical fiber devices

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Design and implementation of a supercomputer frame buffer system 88

Design and implementation of a supercomputer frame buffer sy...

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Proceedings of the 1988 ACM/IEEE conference on Supercomputing

作者： J. D. Fowler A. F. McGrowen Computational Physics Group Los Alamos National Laboratory Los Alamos NM Computer Network Engineering Group Los Alamos National Laboratory Los Alamos NM

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Design and implementation of a supercomputer frame buffer system

Design and implementation of a supercomputer frame buffer sy...

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Supercomputing Conference

作者： J.D. Fowler M. McGowen Computational Physics Group Los Alamos National Laboratory Los Alamos NM USA Computer Network Engineering Group Los Alamos National Laboratory Los Alamos NM USA

A 512-by-512-pixel by 8-bits-per-pixel frame buffer has been designed, constructed, and installed on a 48-Mb/s I/O channel of a Cray X-MP 4/16 supercomputer. This project was undertaken to test whether such a system would be useful and, if so, how it would be used. Supporting software provides the ability to convert vector graphics description files into raster format, to show raster movies interactively, and to show vector files by real-time conversion from vector to raster formats. It has been shown that real-time animations in an interactive supercomputer environment is feasible and useful with this system.< >

关键词： Supercomputers Workstations Application software computer graphics Local area networks Bit rate Spatial resolution computer networks Hardware Time sharing computer systems

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A New Hierarchical Scheme for Combined Routing and Flow Control in Data networks by Application of Positive System Theory

A New Hierarchical Scheme for Combined Routing and Flow Cont...

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American Control Conference (ACC)

作者： M. K. Sundareshan K. H. Muralidhar Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA Communications and Network Laboratory Industrial Technology Institute Ann Arbor MI USA

In this paper we shall present some new results obtained from an application of Positive System Theory [1] to the problem of designing combined routing and flow control strategies for data communication networks. This application permits treating the combined routing and flow control problem in the framework of system stabilization and results in a hierarchical control scheme. The overall control effort consists of a distributed computation of a set of routing parameters at the lower level of network nodes and a computation on a slower time-scale of a set of combined parameters by a Supervisor (network Control Center) at a higher hierarchical level. Specific algorithms are presented for adaptive updating of these parameters in order to realize improved network performance taking into account multiple objectives of end-to-end delay, throughput and nodal buffer management. The combined routing and flow control problem is attaining a great deal of importance in the recent times. This is due to the fact that the routing schemes and the flow control schemes implemented in existing data networks are designed independent of each other, where-as it has recently been determined [2,3] that a high degree of interplay exists between the two forms of control which has to be taken into account for realizing improved network performance. It has also been determined that a hierarchical control structure provides a very useful mechanism for an integration of routing and flow control [4,5].

关键词： Routing Control systems Telecommunication traffic Application software computer networks Distributed computing Throughput Intelligent networks Data flow computing Data engineering

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